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Min, X., Zhang, J., Tu, Y., Li, X., Wang, C., Sas, G. & Elfgren, L. (2024). A full-range fatigue life prediction model for RC beams strengthened with prestressed CFRP plates accounting for the impact of FRP debonding. Engineering structures, 301, Article ID 117305.
Open this publication in new window or tab >>A full-range fatigue life prediction model for RC beams strengthened with prestressed CFRP plates accounting for the impact of FRP debonding
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2024 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 301, article id 117305Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Elsevier, 2024
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-103512 (URN)10.1016/j.engstruct.2023.117305 (DOI)2-s2.0-85179467577 (Scopus ID)
Note

Validerad;2024;Nivå 2;2024-01-19 (signyg)

Funder: Natural Science Foundation of Jiangsu Province of China (grant nos. BK20230703); the Scientific Research Foundation of Nanjing Institute of Technology (grant nos. YKJ202122); the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (23KJB560010); National Key Research and Development Program of China (grant nos. 2017YFC0703006-01); Array (2017YFC0703006-01)

Available from: 2024-01-08 Created: 2024-01-08 Last updated: 2024-02-01Bibliographically approved
Saback, V., Gonzalez-Libreros, J., Daescu, C., Popescu, C., Garmabaki, A. S. & Sas, G. (2024). Adapting to climate change: snow load assessment of snow galleries on the Iron Ore Line in Northern Sweden. Frontiers in Built Environment, 9
Open this publication in new window or tab >>Adapting to climate change: snow load assessment of snow galleries on the Iron Ore Line in Northern Sweden
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2024 (English)In: Frontiers in Built Environment, E-ISSN 2297-3362, Vol. 9Article in journal (Refereed) Published
Abstract [en]

The snow galleries along the Iron Ore railway line in northern Sweden have facedproblems in recent years due to increasingly large snow loads, and several gallerieshave been damaged. These incidents motivated an evaluation of the maximumload supported by the galleries before collapse, which is presented in this study. In2021, a monitoring system was installed in one of the main frames of two snowgalleries built in the 1950s to follow up with temperature and displacements,including a trigger that sends out a warning message when a critical load isreached. A literature review on snow loads was performed, followed bycalculations on snow distribution on the galleries based on the Eurocodes andNational Swedish Standards. Finite element 2D and 3D models were created usingAxisVM to accurately assess the efforts in the structural elements. Analysis anddiscussion are complemented by observations from site visits. It was concludedthat the critical loads supported by the galleries are lower than the requirements oftoday’s standards, but since secondary construction elements were damagedbefore the main frames reached their full capacity, no major collapse has yet takenplace. The cobweb effect (load re-distribution between the neighboring elementsin a 3D structure) influenced the behavior of the galleries in the 3D analysis and thecapacity of the main frames proved to be significantly increased compared to the2D assessment.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2024
National Category
Geotechnical Engineering
Research subject
Structural Engineering; Operation and Maintenance Engineering
Identifiers
urn:nbn:se:ltu:diva-103663 (URN)10.3389/fbuil.2023.1308401 (DOI)
Funder
Vinnova, 2021-02456
Note

Validerad;2024;Nivå 2;2024-01-19 (signyg);

Licens full text: CC BY 4.0

Available from: 2024-01-15 Created: 2024-01-15 Last updated: 2024-02-01Bibliographically approved
Fang, M., Wang, T., Guo, T., Shi, P., Jiang, B., Wang, C., . . . Elfgren, L. (2024). Compressive reactive molecular dynamics on mechanical and structural behaviors of geopolymers: Imposing lateral constraints and varied temperatures. Applied Clay Science, 249, Article ID 107257.
Open this publication in new window or tab >>Compressive reactive molecular dynamics on mechanical and structural behaviors of geopolymers: Imposing lateral constraints and varied temperatures
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2024 (English)In: Applied Clay Science, ISSN 0169-1317, E-ISSN 1872-9053, Vol. 249, article id 107257Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Elsevier Ltd, 2024
National Category
Other Materials Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-103908 (URN)10.1016/j.clay.2024.107257 (DOI)2-s2.0-85182403837 (Scopus ID)
Note

Validerad;2024;Nivå 2;2024-02-16 (joosat);

Funder: National Natural Science Foundation of China (51378104, U23A20661); Jiangsu Province (BZ2021011); Fundamental Research Funds for the Central Universities (2242022k30030, 2242022k30031); National Science Fund for Distinguished Young Scholars (52125802);

Available from: 2024-01-24 Created: 2024-01-24 Last updated: 2024-02-16Bibliographically approved
Wang, T., Cao, J., Guo, T., Tu, Y., Wang, C., Sas, G. & Elfgren, L. (2024). The role of deep learning in reducing computational cost when simulating chloride ion attack on hydrated calcium silicate with molecular dynamics. Construction and Building Materials, 417, Article ID 135257.
Open this publication in new window or tab >>The role of deep learning in reducing computational cost when simulating chloride ion attack on hydrated calcium silicate with molecular dynamics
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2024 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 417, article id 135257Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Elsevier Ltd, 2024
National Category
Other Civil Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-104320 (URN)10.1016/j.conbuildmat.2024.135257 (DOI)2-s2.0-85184522280 (Scopus ID)
Note

Validerad;2024;Nivå 2;2024-02-20 (joosat);

Funder: Natural Science Foundation of China [grant numbers 51378104]; National Science Fund for Distinguished Young Scholars [grant numbers 52125802]; "One belt, one road" innovation cooperation project, Jiangsu Province [grant numbers BZ2021011]; Fundamental Research Funds for the Central Universities [grant numbers 2242022k30030, 2242022k30031];

Available from: 2024-02-20 Created: 2024-02-20 Last updated: 2024-02-20Bibliographically approved
Min, X., Zhang, J., Li, X., Wang, C., Tu, Y., Sas, G. & Elfgren, L. (2023). A nonlinear prediction model of the debonding process of an FRP-concrete interface under fatigue loading. Construction and Building Materials, 369, Article ID 130583.
Open this publication in new window or tab >>A nonlinear prediction model of the debonding process of an FRP-concrete interface under fatigue loading
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2023 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 369, article id 130583Article in journal (Refereed) Published
Abstract [en]

Externally bonded Fiber Reinforced Polymer (FRP) strengthening has been proven to be an efficient and reliable method for structural strengthening of reinforced concrete (RC) members. However, the beneficial effects of this method can be diminished due to the debonding of the FRP laminates. The mechanism of FRP debonding still requires further research, especially for strengthened members under fatigue loading. To understand and predict the FRP fatigue debonding process better, eleven FRP-concrete joint specimens were tested under static or fatigue loading. Both the theoretical derivation and the experimental study indicated that the debonding growth rate of the FRP laminate depended not only on the mean level (), but also the amplitude () of the applied fatigue load. In addition, the debonded portion of the FRP laminate had a significant impact on the following debonding process due to the friction and mechanical interaction between the debonded FRP and the concrete surface. Therefore, a new nonlinear prediction model is proposed in this paper. The proposed model explicitly took into account the amplitude and the mean level of the fatigue loading, which enabled the effect of both to be modelled. Meanwhile, a correction term was also introduced into the model to account for the influence of the previously debonded FRP laminate. The predicted results of the debonding growth rate and the debonding length agreed well with the experimental results.

Place, publisher, year, edition, pages
Elsevier Ltd, 2023
Keywords
Concrete, Debond, Fatigue, Fiber Reinforced Polymer, Interface
National Category
Composite Science and Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-95675 (URN)10.1016/j.conbuildmat.2023.130583 (DOI)000946205000001 ()2-s2.0-85147606490 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-02-21 (joosat);

Funder: Scientific Research Foundation of Nanjing Institute of Technology (YKJ202122); National Key Research and Development Program of China (No. 2017YFC0703006-01)

Available from: 2023-02-21 Created: 2023-02-21 Last updated: 2023-04-21Bibliographically approved
Liu, D., Wang, C., Gonzalez-Libreros, J., Guo, T., Cao, J., Tu, Y., . . . Sas, G. (2023). A review of concrete properties under the combined effect of fatigue and corrosion from a material perspective. Construction and Building Materials, 369, Article ID 130489.
Open this publication in new window or tab >>A review of concrete properties under the combined effect of fatigue and corrosion from a material perspective
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2023 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 369, article id 130489Article, review/survey (Refereed) Published
Abstract [en]

When in use, reinforced concrete bridge structures not only experience high-frequency fatigue loading caused by passing vehicles, but also suffer from the effects of a corrosive environment. In addition to fatigue damage to reinforcement, long-term fatigue loading also causes concrete cracking and deterioration of pore structures, thereby accelerating the ingress of external corrosive substances and reducing concrete durability. Long-term exposure to a corrosive environment also reduces the performance of concrete and causes corrosion of reinforcement materials, affecting the fatigue performance of the structure. Therefore, there is a combined effect between fatigue loads and corrosion on concrete. This paper is a review of the current literature from a material perspective on the performance degradation of concrete under the combined action of fatigue loading and corrosion, that is, carbonation, chloride ion attack, freeze–thaw cycles, and sulphate attack. The paper includes (1) a description of a test method for examining the combined action of fatigue loading and corrosion, (2) a summary of performance degradation of concrete under the combined effect of fatigue loading and corrosion, and (3) an introduction to durability deterioration models considering fatigue damage, and fatigue models that can account for corrosion. Finally, potential future research on concrete under the combined effect of fatigue loading and corrosion is described.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Concrete, Fatigue load, Corrosion, Combined action, Carbonation, Chloride attack, Freeze–thaw cycles, Sulphate attack, Deterioration, Modelling
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-95539 (URN)10.1016/j.conbuildmat.2023.130489 (DOI)000927776800001 ()2-s2.0-85147195723 (Scopus ID)
Funder
Swedish Transport Administration
Note

Validerad;2023;Nivå 2;2023-02-08 (hanlid);

Funder: FOI-BBT program (BBT-2019-022)

Available from: 2023-02-08 Created: 2023-02-08 Last updated: 2023-04-21Bibliographically approved
Raja, P., Murugan, V., Ravichandran, S., Behera, L., Mensah, R. A., Mani, S., . . . Das, O. (2023). A Review of Sustainable Bio-Based Insulation Materials for Energy-Efficient Buildings. Macromolecular materials and engineering, 308(10), Article ID 2300086.
Open this publication in new window or tab >>A Review of Sustainable Bio-Based Insulation Materials for Energy-Efficient Buildings
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2023 (English)In: Macromolecular materials and engineering, ISSN 1438-7492, E-ISSN 1439-2054, Vol. 308, no 10, article id 2300086Article, review/survey (Refereed) Published
Abstract [en]

The surge towards a sustainable future in the construction industry requires the use of bio-based insulation materials as an alternative to conventional ones for improving energy efficiency in structures. In this article, the features of bio-based insulation materials, including their thermal conductivities, moisture buffering value, fire performance, and life cycle evaluations are examined. It is clear from the review that pre- and post-treatment of the bio-based materials used for insulation materials optimize their properties. The life cycle analysis reveals a significant reduction in global warming potential (GWP) compared to conventional foams. In addition, it is envisaged that producing bio-based insulation materials on a larger scale will further decrease the net GWP. The article, therefore, proposes the implementation of policies that will promote the commercialization of bio-based insulation materials.

Place, publisher, year, edition, pages
John Wiley and Sons Inc, 2023
Keywords
construction, degradable materials, fire reactions, insulation, renewable sources
National Category
Energy Systems Wood Science
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-97967 (URN)10.1002/mame.202300086 (DOI)000995935600001 ()2-s2.0-85160288253 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-11-01 (joosat);

Licens fulltext: CC BY License

Available from: 2023-06-07 Created: 2023-06-07 Last updated: 2024-01-17Bibliographically approved
Liu, D., Wang, C., Gonzalez-Libreros, J., Tu, Y., Elfgren, L. & Sas, G. (2023). A review on aerodynamic load and dynamic behavior of railway noise barriers when high-speed trains pass. Journal of Wind Engineering and Industrial Aerodynamics, 239, Article ID 105458.
Open this publication in new window or tab >>A review on aerodynamic load and dynamic behavior of railway noise barriers when high-speed trains pass
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2023 (English)In: Journal of Wind Engineering and Industrial Aerodynamics, ISSN 0167-6105, E-ISSN 1872-8197, Vol. 239, article id 105458Article in journal (Refereed) Published
Abstract [en]

Noise barriers need to be installed along high-speed railway lines to protect nearby inhabitants from the noise pollution caused by the running of high-speed trains (HSTs). The vertical noise barrier is the main structural type. However, when an HST passes through the noise barriers sited along the track, significant and transient aerodynamic pressure will act on the surface of the noise barriers, resulting in strong dynamic responses and even fatigue damage. Therefore, it is important to determine the train-induced aerodynamic load on the barrier surface and analyze the dynamic behaviors of the noise barriers under such a load for its structural design and to guarantee its safety and durability. This paper is a systematic review of the current literature on the aerodynamic load and dynamic behavior of vertical noise barriers; it includes (1) a summary and analysis of characteristics of such aerodynamic pressure and relevant influencing factors, (2) an introduction to measurement methods of aerodynamic load and relevant pressure models on the surface of noise barriers, and (3) a description of the dynamic response and fatigue analysis of noise barriers under such loads. Finally, potential further studies on this topic are discussed, and conclusions are drawn.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Noise barrier, Railway, High-speed train, Aerodynamic load, Dynamic response, Fatigue
National Category
Vehicle Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-98162 (URN)10.1016/j.jweia.2023.105458 (DOI)2-s2.0-85160798389 (Scopus ID)
Funder
Swedish Transport Administration, “Excellence Area 4” and FOI-BBT program (grant number BBT-2019-022)
Note

Validerad;2023;Nivå 2;2023-06-12 (joosat);

Licens fulltext: CC BY License

Available from: 2023-06-12 Created: 2023-06-12 Last updated: 2023-10-12Bibliographically approved
Sarmiento, S., Gonzalez-Libreros, J. & Sas, G. (2023). An improved metamodel-based algorithm to assess reliability analysis of existing structures using FEM.
Open this publication in new window or tab >>An improved metamodel-based algorithm to assess reliability analysis of existing structures using FEM
2023 (English)In: Article in journal (Other academic) Submitted
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-96315 (URN)
Available from: 2023-04-05 Created: 2023-04-05 Last updated: 2023-09-06
Yu, Q., Lin, Y., Guo, T., Wen, R., Wang, C., Tu, Y., . . . Elfgren, L. (2023). Assessing the unsaturated transport and adsorption properties of ions in nanopores of realistic hydrated-calcium-silicate gel using molecular dynamics simulations. Computational materials science, 222, Article ID 112121.
Open this publication in new window or tab >>Assessing the unsaturated transport and adsorption properties of ions in nanopores of realistic hydrated-calcium-silicate gel using molecular dynamics simulations
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2023 (English)In: Computational materials science, ISSN 0927-0256, E-ISSN 1879-0801, Vol. 222, article id 112121Article in journal (Refereed) Published
Abstract [en]

The unsaturated transport of water and ions in concrete structures accelerates the corrosion of reinforcing steel bars. Unfortunately, previous macroscopic and microscopic experimental studies have provided little clarity on the transport mechanisms of ions in calcium-silicate-hydrate (C-S-H) gels. This paper presents molecular dynamics simulations performed to investigate the effect of ion species and concentration during unsaturated transport processes. The transport rate of NaCl solutions at any given concentration significantly exceeds that of CaCl2 solutions because of desorption of intralayer calcium ions in the substrate. Additionally, the electric double layer effect of the realistic C-S-H gel substrate is more pronounced in NaCl solution than in CaCl2 solution and becomes stronger as the concentration increases in both cases. These insights into the effects of ion species and concentration on unsaturated ion transport and adsorption in realistic C-S-H gel nanopores will help guide the development of cement-based materials with improved corrosion resistance.

Place, publisher, year, edition, pages
Elsevier B.V., 2023
Keywords
Adsorption properties, Calcium silicate hydrate, Molecular dynamics simulation, Unsaturated transport
National Category
Physical Chemistry Materials Chemistry
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-96187 (URN)10.1016/j.commatsci.2023.112121 (DOI)2-s2.0-85149757816 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-03-20 (joosat);

Funder: National Natural Science Foundation of China (grant no. 51378104); National Science Fund for Distinguished Young Scholars (grant no. 52125802); “One belt, one road” innovation cooperation project, Jiangsu Province (grant no. BZ2021011)

Available from: 2023-03-20 Created: 2023-03-20 Last updated: 2023-04-21Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-8682-876x

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